Everything has been fine until I decided to repurpose the old exchange server. Before unintstalling exchange and dcpromo'ing the server I simply shut it down to test everything before wiping it out.

When the server was shut down, everything was fine, all blackberry devices work as expected. I did run into one major problem. With the server offline, I'm unable to access the BAS. I get the invalid username or password error. When I turned the server back online, I was able to successfully access BAS.

I've verified that the MAPI settings correctly point to the new server and check name correctly underlines the besadmin account.